Microsoft Windows 11 22H2 (KB5017321) update fails with download error 0x800F0806

A large number of users encountered the Windows 11 KB5017321 forced update cannot be installed and a 0x800F0806 error occurred. According to sources, Microsoft is already investigating the reports.


Microsoft Windows 11 2022 Update (version 22H2) is rolling out to consumers around the world, and many users are already rushing to download the feature update. Microsoft also released Windows 11 KB5017321, a new cumulative update for version 22H2, but the update was unavailable for many users.


And the error message 0x800F0806 given is also rather vague, "2022-09 Cumulative Update for Windows 11 Version 22H2 x64 Systems (KB5017321)" (part of Windows 11 2022 Update / Version 22H2) cannot be installed.


Many PC users have had issues installing KB5017321, which fixes a critical flaw in Windows 11 22H2.


According to sources close to the Windows team, the problem appears to be widespread, and Microsoft is investigating the reports.


How to fix error 0x800F0806 in KB5017321?


Users who encounter one of the error messages when installing Windows 11 version 22H2 should first check the downloads on the Microsoft Update Catalog. Try these simple steps to fix error 0x800F0806:

  • Go to the Microsoft Update Catalog and search for KB5017321. Or click here to download the .msu package directly.

  • Double-click the .msu and click Next, agree to the terms and conditions when asked.

  • Click Next and install the package.

  • Reboot the system.

  • Check for updates and the error should not reappear.

If that doesn't work, users can try the advanced steps below to fix the error message:

  • Open Windows Search/Start and type Command Prompt.

  • Select the Command Prompt entry and click "Run as administrator".

  • Copy and paste this into the command prompt: dism /online/cleanup-image /startcomponentcleanup

  • Wait for the command to run and finally reboot the system.

  • Check for updates again.

If the problem persists and nothing works, users can always pause the update and wait a few weeks. Microsoft is expected to release patches for the Windows 11 2022 update soon, and users can also download the Windows 11 22H2 ISO image and perform a clean install to fix bugs.

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